//go:build integration

package repository

import (
	"context"
	"fmt"
	"strings"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/stretchr/testify/require"

	"github.com/Wei-Shaw/sub2api/internal/service"
)

func TestUsageBillingRepositoryApply_DeduplicatesBalanceBilling(t *testing.T) {
	ctx := context.Background()
	client := testEntClient(t)
	repo := NewUsageBillingRepository(client, integrationDB)

	user := mustCreateUser(t, client, &service.User{
		Email:        fmt.Sprintf("usage-billing-user-%d@example.com", time.Now().UnixNano()),
		PasswordHash: "hash",
		Balance:      100,
	})
	apiKey := mustCreateApiKey(t, client, &service.APIKey{
		UserID: user.ID,
		Key:    "sk-usage-billing-" + uuid.NewString(),
		Name:   "billing",
		Quota:  1,
	})
	account := mustCreateAccount(t, client, &service.Account{
		Name: "usage-billing-account-" + uuid.NewString(),
		Type: service.AccountTypeAPIKey,
	})

	requestID := uuid.NewString()
	cmd := &service.UsageBillingCommand{
		RequestID:           requestID,
		APIKeyID:            apiKey.ID,
		UserID:              user.ID,
		AccountID:           account.ID,
		AccountType:         service.AccountTypeAPIKey,
		BalanceCost:         1.25,
		APIKeyQuotaCost:     1.25,
		APIKeyRateLimitCost: 1.25,
	}

	result1, err := repo.Apply(ctx, cmd)
	require.NoError(t, err)
	require.NotNil(t, result1)
	require.True(t, result1.Applied)
	require.True(t, result1.APIKeyQuotaExhausted)

	result2, err := repo.Apply(ctx, cmd)
	require.NoError(t, err)
	require.NotNil(t, result2)
	require.False(t, result2.Applied)

	var balance float64
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT balance FROM users WHERE id = $1", user.ID).Scan(&balance))
	require.InDelta(t, 98.75, balance, 0.000001)

	var quotaUsed float64
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT quota_used FROM api_keys WHERE id = $1", apiKey.ID).Scan(&quotaUsed))
	require.InDelta(t, 1.25, quotaUsed, 0.000001)

	var usage5h float64
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT usage_5h FROM api_keys WHERE id = $1", apiKey.ID).Scan(&usage5h))
	require.InDelta(t, 1.25, usage5h, 0.000001)

	var status string
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT status FROM api_keys WHERE id = $1", apiKey.ID).Scan(&status))
	require.Equal(t, service.StatusAPIKeyQuotaExhausted, status)

	var dedupCount int
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT COUNT(*) FROM usage_billing_dedup WHERE request_id = $1 AND api_key_id = $2", requestID, apiKey.ID).Scan(&dedupCount))
	require.Equal(t, 1, dedupCount)
}

func TestUsageBillingRepositoryApply_DeduplicatesSubscriptionBilling(t *testing.T) {
	ctx := context.Background()
	client := testEntClient(t)
	repo := NewUsageBillingRepository(client, integrationDB)

	user := mustCreateUser(t, client, &service.User{
		Email:        fmt.Sprintf("usage-billing-sub-user-%d@example.com", time.Now().UnixNano()),
		PasswordHash: "hash",
	})
	group := mustCreateGroup(t, client, &service.Group{
		Name:             "usage-billing-group-" + uuid.NewString(),
		Platform:         service.PlatformAnthropic,
		SubscriptionType: service.SubscriptionTypeSubscription,
	})
	apiKey := mustCreateApiKey(t, client, &service.APIKey{
		UserID:  user.ID,
		GroupID: &group.ID,
		Key:     "sk-usage-billing-sub-" + uuid.NewString(),
		Name:    "billing-sub",
	})
	subscription := mustCreateSubscription(t, client, &service.UserSubscription{
		UserID:  user.ID,
		GroupID: group.ID,
	})

	requestID := uuid.NewString()
	cmd := &service.UsageBillingCommand{
		RequestID:        requestID,
		APIKeyID:         apiKey.ID,
		UserID:           user.ID,
		AccountID:        0,
		SubscriptionID:   &subscription.ID,
		SubscriptionCost: 2.5,
	}

	result1, err := repo.Apply(ctx, cmd)
	require.NoError(t, err)
	require.True(t, result1.Applied)

	result2, err := repo.Apply(ctx, cmd)
	require.NoError(t, err)
	require.False(t, result2.Applied)

	var dailyUsage float64
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT daily_usage_usd FROM user_subscriptions WHERE id = $1", subscription.ID).Scan(&dailyUsage))
	require.InDelta(t, 2.5, dailyUsage, 0.000001)
}

func TestUsageBillingRepositoryApply_RequestFingerprintConflict(t *testing.T) {
	ctx := context.Background()
	client := testEntClient(t)
	repo := NewUsageBillingRepository(client, integrationDB)

	user := mustCreateUser(t, client, &service.User{
		Email:        fmt.Sprintf("usage-billing-conflict-user-%d@example.com", time.Now().UnixNano()),
		PasswordHash: "hash",
		Balance:      100,
	})
	apiKey := mustCreateApiKey(t, client, &service.APIKey{
		UserID: user.ID,
		Key:    "sk-usage-billing-conflict-" + uuid.NewString(),
		Name:   "billing-conflict",
	})

	requestID := uuid.NewString()
	_, err := repo.Apply(ctx, &service.UsageBillingCommand{
		RequestID:   requestID,
		APIKeyID:    apiKey.ID,
		UserID:      user.ID,
		BalanceCost: 1.25,
	})
	require.NoError(t, err)

	_, err = repo.Apply(ctx, &service.UsageBillingCommand{
		RequestID:   requestID,
		APIKeyID:    apiKey.ID,
		UserID:      user.ID,
		BalanceCost: 2.50,
	})
	require.ErrorIs(t, err, service.ErrUsageBillingRequestConflict)
}

func TestUsageBillingRepositoryApply_UpdatesAccountQuota(t *testing.T) {
	ctx := context.Background()
	client := testEntClient(t)
	repo := NewUsageBillingRepository(client, integrationDB)

	user := mustCreateUser(t, client, &service.User{
		Email:        fmt.Sprintf("usage-billing-account-user-%d@example.com", time.Now().UnixNano()),
		PasswordHash: "hash",
	})
	apiKey := mustCreateApiKey(t, client, &service.APIKey{
		UserID: user.ID,
		Key:    "sk-usage-billing-account-" + uuid.NewString(),
		Name:   "billing-account",
	})
	account := mustCreateAccount(t, client, &service.Account{
		Name: "usage-billing-account-quota-" + uuid.NewString(),
		Type: service.AccountTypeAPIKey,
		Extra: map[string]any{
			"quota_limit": 100.0,
		},
	})

	_, err := repo.Apply(ctx, &service.UsageBillingCommand{
		RequestID:        uuid.NewString(),
		APIKeyID:         apiKey.ID,
		UserID:           user.ID,
		AccountID:        account.ID,
		AccountType:      service.AccountTypeAPIKey,
		AccountQuotaCost: 3.5,
	})
	require.NoError(t, err)

	var quotaUsed float64
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT COALESCE((extra->>'quota_used')::numeric, 0) FROM accounts WHERE id = $1", account.ID).Scan(&quotaUsed))
	require.InDelta(t, 3.5, quotaUsed, 0.000001)
}

func TestDashboardAggregationRepositoryCleanupUsageBillingDedup_BatchDeletesOldRows(t *testing.T) {
	ctx := context.Background()
	repo := newDashboardAggregationRepositoryWithSQL(integrationDB)

	oldRequestID := "dedup-old-" + uuid.NewString()
	newRequestID := "dedup-new-" + uuid.NewString()
	oldCreatedAt := time.Now().UTC().AddDate(0, 0, -400)
	newCreatedAt := time.Now().UTC().Add(-time.Hour)

	_, err := integrationDB.ExecContext(ctx, `
		INSERT INTO usage_billing_dedup (request_id, api_key_id, request_fingerprint, created_at)
		VALUES ($1, 1, $2, $3), ($4, 1, $5, $6)
	`,
		oldRequestID, strings.Repeat("a", 64), oldCreatedAt,
		newRequestID, strings.Repeat("b", 64), newCreatedAt,
	)
	require.NoError(t, err)

	require.NoError(t, repo.CleanupUsageBillingDedup(ctx, time.Now().UTC().AddDate(0, 0, -365)))

	var oldCount int
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT COUNT(*) FROM usage_billing_dedup WHERE request_id = $1", oldRequestID).Scan(&oldCount))
	require.Equal(t, 0, oldCount)

	var newCount int
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT COUNT(*) FROM usage_billing_dedup WHERE request_id = $1", newRequestID).Scan(&newCount))
	require.Equal(t, 1, newCount)

	var archivedCount int
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT COUNT(*) FROM usage_billing_dedup_archive WHERE request_id = $1", oldRequestID).Scan(&archivedCount))
	require.Equal(t, 1, archivedCount)
}

func TestUsageBillingRepositoryApply_DeduplicatesAgainstArchivedKey(t *testing.T) {
	ctx := context.Background()
	client := testEntClient(t)
	repo := NewUsageBillingRepository(client, integrationDB)
	aggRepo := newDashboardAggregationRepositoryWithSQL(integrationDB)

	user := mustCreateUser(t, client, &service.User{
		Email:        fmt.Sprintf("usage-billing-archive-user-%d@example.com", time.Now().UnixNano()),
		PasswordHash: "hash",
		Balance:      100,
	})
	apiKey := mustCreateApiKey(t, client, &service.APIKey{
		UserID: user.ID,
		Key:    "sk-usage-billing-archive-" + uuid.NewString(),
		Name:   "billing-archive",
	})

	requestID := uuid.NewString()
	cmd := &service.UsageBillingCommand{
		RequestID:   requestID,
		APIKeyID:    apiKey.ID,
		UserID:      user.ID,
		BalanceCost: 1.25,
	}

	result1, err := repo.Apply(ctx, cmd)
	require.NoError(t, err)
	require.True(t, result1.Applied)

	_, err = integrationDB.ExecContext(ctx, `
		UPDATE usage_billing_dedup
		SET created_at = $1
		WHERE request_id = $2 AND api_key_id = $3
	`, time.Now().UTC().AddDate(0, 0, -400), requestID, apiKey.ID)
	require.NoError(t, err)
	require.NoError(t, aggRepo.CleanupUsageBillingDedup(ctx, time.Now().UTC().AddDate(0, 0, -365)))

	result2, err := repo.Apply(ctx, cmd)
	require.NoError(t, err)
	require.False(t, result2.Applied)

	var balance float64
	require.NoError(t, integrationDB.QueryRowContext(ctx, "SELECT balance FROM users WHERE id = $1", user.ID).Scan(&balance))
	require.InDelta(t, 98.75, balance, 0.000001)
}